Chromatography is a foundational analytical technique that serves as a versatile tool for the separation, identification, and purification of components within complex mixtures. This chapter provides a comprehensive overview of the key concepts and methodologies associated with chromatography and its various techniques. At its core, chromatography operates on the principle of differential adsorption of molecules onto a stationary phase, driven by a mobile phase. In this chapter, essential terminology related to chromatography is thoroughly explored, ensuring a robust understanding of the field. Various chromatographic techniques, such as gas chromatography, liquid chromatography (LC), high-performance LC, and thin-layer chromatography, are examined in detail, highlighting their specific applications and advantages. Furthermore, the chapter discusses methods for chromatographic development and elaborates on the theoretical frameworks underlying chromatography, offering insights into the kinetics and mechanisms involved in the separation process. The diverse applications of chromatography extend across numerous disciplines, including chemistry, biochemistry, pharmaceutical analysis, environmental sciences, and forensic sciences. By the end of this chapter, readers will gain a holistic understanding of chromatography and its multifaceted utility in diverse scientific domains, along with insights into recent advancements and future directions in chromatographic research.